Update .travis.yml and .kitchen.yml files for parallel testing

Change-Id: Ibdb77015ccff6c89a3f0d4c7521e4b0df9242861

.kitchen.travis.yml

@@ -0,0 +1,6 @@
+suites:
+
+  - name: <%= ENV['SUITE'] %>
+    provisioner:
+      pillars-from-files:
+        neutron.sls: tests/pillar/<%= ENV['SUITE'] %>.sls

.travis.yml

@@ -17,15 +17,17 @@ install:
   - bundle install
 
 env:
-    - PLATFORM=trevorj/salty-whales:trusty
-    - PLATFORM=trevorj/salty-whales:xenial
+    - PLATFORM=trevorj/salty-whales:trusty SUITE=master_cluster
+    - PLATFORM=trevorj/salty-whales:xenial SUITE=master_cluster
+    - PLATFORM=trevorj/salty-whales:trusty SUITE=slave_cluster
+    - PLATFORM=trevorj/salty-whales:xenial SUITE=slave_cluster
 
 before_script:
   - set -o pipefail
   - make test | tail
 
 script:
-  - test ! -e .kitchen.yml || bundle exec kitchen test -t tests/integration
+  - KITCHEN_LOCAL_YAML=.kitchen.travis.yml bundle exec kitchen test -t tests/integration
 
 notifications:
   webhooks: